The term "PCS" can refer to different things depending on the context. Here are two possible answers based on the search results:

• The Pacific Championship Series (PCS) is the top level of professional League of Legends in Taiwan, Hong Kong, Macau, Southeast Asia (excluding Vietnam), and Oceania. The league features teams from five different countries and regions: Taiwan, Hong Kong, Singapore, the Philippines, and previously Malaysia and Thailand.

• Regional PCS Areas (RPC) is a term used by the Federal Communications Commission (FCC) to refer to the five regions of the United States for the purpose of licensing Personal Communications Services (PCS) .